Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 1441-1460 of 11350
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Kepadatan Populasi Ikan Medaka (Oryzias Javanicus Blekker, 1854) di Kawasan Mangrove Sicanang Kelurahan Belawan Sicanang Kecamatan Medan Belawan
(Universitas Sumatera Utara, 2023)Research on population density of ricefish (Oryzias javanicus) in Mangrove Sicanang Area Kelurahan Belawan Sicanang Kecamatan Medan Belawan was carried out on May-June 2022. The purpose of this study was to analyze the ... -
Implementasi Economic Order Quantity (EOQ) Untuk Efisiensi Persediaan Bahan Baku Produksi Kain Bordir Songket UD. Niar Medan
(Universitas Sumatera Utara, 2022)Inventory control is a very important action in calculating the optimal amount of inventory levels required. Inventory of raw materials is one of the factors in the production process. Lack of raw materials will result in ... -
Studi Perbandingan Penggunaan Kitosan dan Kitosan Larut Air dalam Pembuatan Obat Kumur Ekstrak Etanol Serai Wangi (Cymbopogon nardus (L.) Rendle)
(Universitas Sumatera Utara, 2022)Water soluble chitosan is effective as an antibacterial compared to natural chitosan, because water-soluble chitosan has a high degree of deacetylation (DD) and a low MW. The higher the DD tends to have bacterial activity, ... -
Estimasi Parameter Regresi Non Parametrik Menggunakan Bootstrap
(2022)This study aims to estimate non-parametric regression parameters using a spline truncated approach. The approach used is the Ordinary Least Square method and the Bootstrap method. The estimation results are then compared ... -
Pengaruh Penambahan Ampas Daun Teh terhadap Sifat Fisis dan Sifat Mekanik Pada Beton
(Universitas Sumatera Utara, 2022)Research has been carried out on construction concrete with the addition of tea leaf pulp. This concrete method uses mixed variations of 0%, 2%, 4% and 6% with the addition of tea leaf pulp as a substitute for part of ... -
Karakterisasi paduan EPDM/NR dengan Pengisi Serbuk batu kapur sebagai peredam benturan pintu kendaraan (weather strip)
(Universitas Sumatera Utara, 2023)A composite of EPDM/NR alloy which is then added with limestone powder as a filler which is applied as a vehicle door impact absorber (Weather strip). The natural rubber used is SIR 20 natural rubber. EPDM synthetic rubber ... -
Pembuatan Metil Selulosa dari Ampas Tebu (Saccharum Officinarum L.) dengan Dimetil Sulfat (DMS) Melalui Reaksi Eterifikasi dengan Variasi NaOH dan Temperatur
(Universitas Sumatera Utara, 2022)The production of methyl cellulose was carried out through an etherification reaction between α-cellulose isolated from bagasse (Saccharum officinarum L.) and dimethyl sulfate. α-cellulose was carried out by adding 3.5% ... -
Modifikasi Pati Sukun (Artocarpus altilis) menjadi Nanopartikel Pati Sukun Fosfat Melalui Ikat Silang dengan Natrium Tripolifosfat
(Universitas Sumatera Utara, 2023)Modification of breadfruit starch phosphate nanoparticles had been caried out through a cross linking reaction between breadfruit starch (Artocarpus altilis) and trisodium tripolyphosphate (STPP). This research was conducted ... -
Pengaruh Sifat Reologi Pada Modifikasi Aspal dengan Akrilik dan Liquid Natural Rubber (LNR) Menggunakan Triton X-114
(Universitas Sumatera Utara, 2023)Research has been done on the Effect of Rheological Properties on Modified Asphalt and Liquid Natural Rubber (LNR) with Acrylic using Triton X-114 Emulsifier. This study aims to determine the rheological properties of a ... -
Studi Ketahanan Oksidasi Pada Fe-Ni-Cr-Al-Ti dengan Metode Flame Spray Coating
(Universitas Sumatera Utara, 2022)The walter walll tube component found in the circulalting fluidized bed (CFB) boiler operaltes alt very high temperaltures (800–900 °C) alnd operaltes in aln albralsive environment. These working conditions often result ... -
Sintesis dan Karakteristik Fasa Cu-Cr-O Menggunakan Pelarut H2so4 dan HNO3 dengan Metode SOL-GEL
(Universitas Sumatera Utara, 2022)Cu-Cr-O material was a material that hat a delafossite structure and potentially hat good thermoelectric properties. In this study, the Cu-Cr-O material has been synthesized using the sol-gel method using H₂SO4 and HNO3 ... -
Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Daun Tumbuhan Bakau Burus (Bruguiera cylindrica (L.) Blume)
(Universitas Sumatera Utara, 2022)Isolation and identification of flavonoid compound from Bakau Burus Leaves (Bruguiera cylindrica (L.) Blume) has been done through the maceration extraction step with methanol solvent. Methanol fraction was evaporated, ... -
Pembuatan dan Karakterisasi Beton dengan Campuran Abu Sekam Padi dan Serat Daun Nanas terhadap Sifat Fisis dan Mekanik Pada Beton
(Universitas Sumatera Utara, 2022)Research on the manufacture of construction concrete based on rice husk ash and pineapple leaf fiber by the method of cast in situ. The concrete made in this study had several variations, namely 0%, 2,5%, 5%, and 7,5% with ... -
Pemanfaatan Kitosan Rajungan (Portunus pelagicus) yang Termodifikasi Asam Sitrat sebagai Pengawet pada Ikan Kakap Merah (Lutjanus sp.)
(Universitas Sumatera Utara, 2023)Utilization of chitosan crabs (Portunus pelagicus) modified with citric acid as a preservative in red snapper has been carried out using the soaking method for 10 minutes with variations of 1% chitosan, 1% citric acid, 1% ... -
Pengontrolan Temperature Konstan Hotplate Pemanas Kopi dengan Sensor Lm35 Memanfaatkan Library Pid Arduino
(Universitas Sumatera Utara, 2022)Automatic coffee heating hotplates used a PID control system were used so that the desired temperature can be maintained and remains stable and the output error was small. By adding a PID controller to the device, it was ... -
Rancang Bangun Pendeteksi Asap Rokok Berbasis Arduino Uno dengan Output Suara dan Lampu Otomatis
(Universitas Sumatera Utara, 2021)With the increasing number of indoor users who are dominated by smokers in closed users, it greatly affects the health of both smokers and non-smokers. Until now, the problem of cigarette smoke in public places is still ... -
Identifikasi dan Pravelensi Ektoparasit pada Ikan Nila (Oreochromis niloticus) di Kolam Air Tenang Desa Tatengger, Kecamatan Angkola Muara Tais, Kabupaten Tapanuli Selatan
(Universitas Sumatera Utara, 2023)Research has been carried out on the Identification and Prevalence of Ectoparasites in Tilapia (Oreochromis niloticus) in calm water ponds in Tategger Village, Sub-District Angkola Muara Tais, District South Tapanuli from ... -
Isolasi dan Uji Aktivitas Enzim Amilase dari Kecambah Kacang Merah (Phaseolus Vulgaris) dengan Amobilisasi Menggunakan Gel Poliakrilamida
(Universitas Sumatera Utara, 2022)Amylase enzymes can be isolated from various plants such as sprouts. In this study the amylase enzyme was isolated from red bean sprouts (Phaseoulus vulgaris) with 48 hours of germination. The isolated sprouts produced a ... -
“Jenis, Prevalensi dan Intensitas Ektoparasit Pada Sapi Bali (Bos Sondaicus) di Taman Satwa Citra Pesona Ladangku, Pancur Batu, Kabupaten Deli Serdang, Sumatera Utara
(Universitas Sumatera Utara, 2022)This study was conducted in March 2022 with the aim of knowing the type, prevalence and intensity of ectoparasites in Bali cattle (B. sondaicus) at Taman Citra Pesona Ladangku, Pancur Batu, Deli Serdang Regency, North ... -
Sintesis Carbon Dots dari Kulit Jengkol dengan Doping CuCl2 Menggunakan Metode Hidrotermal
(Universitas Sumatera Utara, 2023)Synthesis of Carbon dots from jengkol skin with CuCl2 doping using the hydrothermal method has been carried out. CuCl2 solution was used as doping agent. Jengkol peel powder without and with the addition of CuCl2 with ...